21019674 has 32 divisors (see below), whose sum is σ = 46738944. Its totient is φ = 6258240.

The previous prime is 21019657. The next prime is 21019699. The reversal of 21019674 is 47691012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1929 + ... + 6764.

It is an arithmetic number, because the mean of its divisors is an integer number (1460592).

Almost surely, 2^21019674 is an apocalyptic number.

21019674 is an abundant number, since it is smaller than the sum of its proper divisors (25719270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21019674 is a wasteful number, since it uses less digits than its factorization.

21019674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8742.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21019674 is about 4584.7218018109. The cubic root of 21019674 is about 275.9785480071.

The spelling of 21019674 in words is "twenty-one million, nineteen thousand, six hundred seventy-four".